Difference between revisions of "Talk:Broadcom HD Decoder"

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Q: Aside from providing 1080P output, will this speed up the overall performance of the AppleTV?  Even if you still are viewing in 720P?
 
Q: Aside from providing 1080P output, will this speed up the overall performance of the AppleTV?  Even if you still are viewing in 720P?
 
A: Yes. For example, I couldn't watch some action movies encoded with x264 high bitrate. No more jerks when the whole frame moves.
 
A: Yes. For example, I couldn't watch some action movies encoded with x264 high bitrate. No more jerks when the whole frame moves.
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To clarify the above statement on providing 1080p output, the XBMC software (the only program that currently supports Broadcom HD Decoder on Apple TV) is deliberately limited on the Apple TV OS a display resolution of 1280x720. If the AppleTV is configured to output 1080p and are playing 1080p content via XBMC/CrystalHD Decoder the following will happen. Crystal HD decoder will decode 1080p content, this will be downscaled to 1280x720 and rendered by XBMC. Then the Nvidia graphics card will hardware upscale the output to 1080p. This impacts quality but not performance.
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Running XBMC on an AppleTV that runs Linux with properly configured Nvidia and Crystal HD drivers will decode and output native 1080P without intermediate scaling.

Revision as of 01:29, 21 January 2010

Q: Aside from providing 1080P output, will this speed up the overall performance of the AppleTV? Even if you still are viewing in 720P? A: Yes. For example, I couldn't watch some action movies encoded with x264 high bitrate. No more jerks when the whole frame moves.

To clarify the above statement on providing 1080p output, the XBMC software (the only program that currently supports Broadcom HD Decoder on Apple TV) is deliberately limited on the Apple TV OS a display resolution of 1280x720. If the AppleTV is configured to output 1080p and are playing 1080p content via XBMC/CrystalHD Decoder the following will happen. Crystal HD decoder will decode 1080p content, this will be downscaled to 1280x720 and rendered by XBMC. Then the Nvidia graphics card will hardware upscale the output to 1080p. This impacts quality but not performance.

Running XBMC on an AppleTV that runs Linux with properly configured Nvidia and Crystal HD drivers will decode and output native 1080P without intermediate scaling.